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In page Tibetan Buddhism:

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An emphasis on oral transmission as more important than the printed word derives from the earliest period of Indian Buddhism, when it allowed teachings to be kept from those who should not hear them.[1] Hearing a teaching (transmission) readies the hearer for realization based on it. The person from whom one hears the teaching should have heard it as one link in a succession of listeners going back to the original speaker: the Buddha in the case of a sutra or the author in the case of a book. Then the hearing constitutes an authentic lineage of transmission. Authenticity of the oral lineage is a prerequisite for realization, hence the importance of lineages.[citation needed]